Showing the changes to java/pkg/sun/awt/image/JPEGImageDecoder.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 1995, 2003, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +/*- | |
| 26 | + * Reads JPEG images from an InputStream and reports the | |
| 27 | + * image data to an InputStreamImageSource object. | |
| 28 | + * | |
| 29 | + * The native implementation of the JPEG image decoder was adapted from | |
| 30 | + * release 6 of the free JPEG software from the Independent JPEG Group. | |
| 31 | + */ | |
| 32 | +package sun.awt.image; | |
| 33 | + | |
| 34 | +import java.util.Vector; | |
| 35 | +import java.util.Hashtable; | |
| 36 | +import java.io.InputStream; | |
| 37 | +import java.io.IOException; | |
| 38 | +import java.awt.image.*; | |
| 39 | + | |
| 40 | +/** | |
| 41 | + * JPEG Image converter | |
| 42 | + * | |
| 43 | + * @author Jim Graham | |
| 44 | + */ | |
| 45 | +public class JPEGImageDecoder extends ImageDecoder { | |
| 46 | + private static ColorModel RGBcolormodel; | |
| 47 | + private static ColorModel ARGBcolormodel; | |
| 48 | + private static ColorModel Graycolormodel; | |
| 49 | + | |
| 50 | + private static final Class InputStreamClass = InputStream.class; | |
| 51 | + private static native void initIDs(Class InputStreamClass); | |
| 52 | + | |
| 53 | + private ColorModel colormodel; | |
| 54 | + | |
| 55 | + static { | |
| 56 | + java.security.AccessController.doPrivileged( | |
| 57 | + new sun.security.action.LoadLibraryAction("jpeg")); | |
| 58 | + initIDs(InputStreamClass); | |
| 59 | + RGBcolormodel = new DirectColorModel(24, 0xff0000, 0xff00, 0xff); | |
| 60 | + ARGBcolormodel = ColorModel.getRGBdefault(); | |
| 61 | + byte g[] = new byte[256]; | |
| 62 | + for (int i = 0; i < 256; i++) { | |
| 63 | + g[i] = (byte) i; | |
| 64 | + } | |
| 65 | + Graycolormodel = new IndexColorModel(8, 256, g, g, g); | |
| 66 | + } | |
| 67 | + | |
| 68 | + private native void readImage(InputStream is, byte buf[]) | |
| 69 | + throws ImageFormatException, IOException; | |
| 70 | + | |
| 71 | + Hashtable props = new Hashtable(); | |
| 72 | + | |
| 73 | + public JPEGImageDecoder(InputStreamImageSource src, InputStream is) { | |
| 74 | + super(src, is); | |
| 75 | + } | |
| 76 | + | |
| 77 | + /** | |
| 78 | + * An error has occurred. Throw an exception. | |
| 79 | + */ | |
| 80 | + private static void error(String s1) throws ImageFormatException { | |
| 81 | + throw new ImageFormatException(s1); | |
| 82 | + } | |
| 83 | + | |
| 84 | + public boolean sendHeaderInfo(int width, int height, | |
| 85 | + boolean gray, boolean hasalpha, | |
| 86 | + boolean multipass) | |
| 87 | + { | |
| 88 | + setDimensions(width, height); | |
| 89 | + | |
| 90 | + setProperties(props); | |
| 91 | + if (gray) { | |
| 92 | + colormodel = Graycolormodel; | |
| 93 | + } else { | |
| 94 | + if (hasalpha) { | |
| 95 | + colormodel = ARGBcolormodel; | |
| 96 | + } else { | |
| 97 | + colormodel = RGBcolormodel; | |
| 98 | + } | |
| 99 | + } | |
| 100 | + | |
| 101 | + setColorModel(colormodel); | |
| 102 | + | |
| 103 | + int flags = hintflags; | |
| 104 | + if (!multipass) { | |
| 105 | + flags |= ImageConsumer.SINGLEPASS; | |
| 106 | + } | |
| 107 | + setHints(hintflags); | |
| 108 | + headerComplete(); | |
| 109 | + | |
| 110 | + return true; | |
| 111 | + } | |
| 112 | + | |
| 113 | + public boolean sendPixels(int pixels[], int y) { | |
| 114 | + int count = setPixels(0, y, pixels.length, 1, colormodel, | |
| 115 | + pixels, 0, pixels.length); | |
| 116 | + if (count <= 0) { | |
| 117 | + aborted = true; | |
| 118 | + } | |
| 119 | + return !aborted; | |
| 120 | + } | |
| 121 | + | |
| 122 | + public boolean sendPixels(byte pixels[], int y) { | |
| 123 | + int count = setPixels(0, y, pixels.length, 1, colormodel, | |
| 124 | + pixels, 0, pixels.length); | |
| 125 | + if (count <= 0) { | |
| 126 | + aborted = true; | |
| 127 | + } | |
| 128 | + return !aborted; | |
| 129 | + } | |
| 130 | + | |
| 131 | + /** | |
| 132 | + * produce an image from the stream. | |
| 133 | + */ | |
| 134 | + public void produceImage() throws IOException, ImageFormatException { | |
| 135 | + try { | |
| 136 | + readImage(input, new byte[1024]); | |
| 137 | + if (!aborted) { | |
| 138 | + imageComplete(ImageConsumer.STATICIMAGEDONE, true); | |
| 139 | + } | |
| 140 | + } catch (IOException e) { | |
| 141 | + if (!aborted) { | |
| 142 | + throw e; | |
| 143 | + } | |
| 144 | + } finally { | |
| 145 | + close(); | |
| 146 | + } | |
| 147 | + } | |
| 148 | + | |
| 149 | + /** | |
| 150 | + * The ImageConsumer hints flag for a JPEG image. | |
| 151 | + */ | |
| 152 | + private static final int hintflags = | |
| 153 | + ImageConsumer.TOPDOWNLEFTRIGHT | ImageConsumer.COMPLETESCANLINES | | |
| 154 | + ImageConsumer.SINGLEFRAME; | |
| 155 | +} | |